Chapter 10 (Projectile and Satellite Motion) Test Review

Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one fired at (neglect air resistance) A) 30 degrees. B) 60 degrees. C) Both hit at the same time.

A) 30 degrees.

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of A) 40 degrees. B) 45 degrees. C) 55 degrees. D) 60 degrees. E) none of these

A) 40 degrees.

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the top of the cliff is A) 5 m. B) 10 m. C) 15 m.

A) 5 m.

Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it is A) about 5 m below the straight line. B) about 10 m below the straight line. C) about 15 m below the straight line.

A) about 5 m below the straight line.

A vertically oriented rocket that is somehow able to maintain a continuous upward velocity of 8 km/s will A) escape from the Earth. B) be unable to escape the Earth. C) eventually maintain a fixed orbit around the sun.

A) escape from the Earth.

An Earth satellite is simply a projectile A) freely falling around the Earth. B) floating motionless in space near the Earth. C) approaching the Earth from outer space.

A) freely falling around the Earth.

Consider a moon that orbits one of our most distant planets in an elliptical path. The distance that the moon covers each day is A) greatest when the moon is closest to the planet. B) greatest when the moon is furthest from the planet. C) the same regardless of its distance from the sun. D) the same regardless of its distance from the planet.

A) greatest when the moon is closest to the planet.

A lunar month is about 28 days. If the moon were closer to the Earth than it is now, the lunar month would be A) less than 28 days. B) more than 28 days. C) unchanged at 28 days.

A) less than 28 days.

Minimal orbital speed about the Earth is about 8 km/s. Minimal orbital speed about the moon would be A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.

A) less than 8 km/s.

Compared to the period of satellites in orbit close to the Earth, the period of satellites in orbit far from the Earth is A) longer. B) shorter. C) the same. D) not enough information

A) longer.

A lunar month is about 28 days. If the moon were farther from the Earth than it is now, the lunar month would be A) more than 28 days. B) less than 28 days. C) about 28 days. D) difficult to predict without much more information.

A) more than 28 days.

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is A) nearest the Earth. B) farthest from the Earth. C) It travels at constant speed everywhere in orbit.

A) nearest the Earth.

The tangential velocity of an Earth satellite is its velocity A) parallel to the surface of the Earth. B) perpendicular to the surface of the Earth. C) attributed to satellites moving in any direction.

A) parallel to the surface of the Earth.

A rocket coasts in an elliptical orbit about the Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let "Fd = change in KE" guide your thinking.) A) perigee, where it is closest and fastest B) apogee, where it is farthest and slowest C) same either location

A) perigee, where it is closest and fastest

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? A) the dropped one B) the fired one C) Both hit at the same time.

A) the dropped one

The speeds of the planets about the sun depend on A) their distances from the sun. B) the masses of the planets. C) their periods of rotation. D) None of the above are correct.

A) their distances from the sun.

An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be A) 0 g. B) 1 g downward. C) 1 g upward. D) larger than 1 g. E) none of these

B) 1 g downward.

An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north? A) 41 km/h B) 100 km/h C) 110 km/h D) 141 km/h

B) 100 km/h

A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is A) less than 50 m/s. B) 50 m/s. C) more than 50 m/s.

B) 50 m/s.

The force of gravity does work on a satellite when it is in A) circular orbit. B) elliptical orbit. C) both of these D) neither of these

B) elliptical orbit.

A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because A) it is not acted on by any forces. B) it is not acted on by any horizontal forces. C) it has no vertical component of velocity to begin with. D) the net force acting on it is zero. E) none of these

B) it is not acted on by any horizontal forces.

From Earth, one satellite appears to overtake another. The faster satellite is A) higher. B) lower. C) smaller. D) can't say

B) lower.

Acceleration is greater for a satellite when it is at the A) apogee. B) perigee. C) zenith. D) same acceleration at all of the above places.

B) perigee

Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity A) decreases. B) remains constant. C) increases.

B) remains constant.

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity A) increases. B) remains unchanged. C) decreases.

B) remains unchanged.

A hunter on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? A) the dropped one B) the fired one C) Both hit at the same time.

B) the fired one

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in A) less than 0.5 s. B) more than 0.5 s. C) 0.5 s.

C) 0.5 s.

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later? A) 50 m B) 98 C) 100 D) 490 E) none of these

C) 100

An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of A) 0 km/h. B) 100 km/h. C) 141 km/h. D) 200 km/h.

C) 141 km/h.

It takes Pluto a longer time to orbit the sun than the Earth does because Pluto A) has much further to go. B) goes much slower. C) Choices A and B are both correct. D) none of the above

C) Choices A and B are both correct.

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed? A) about 5 m/s B) about 10 m/s C) about 20 m/s D) about 25 m/s E) none of these

C) about 20 m/s

A satellite near the Earth makes a full circle in about an hour and a half. How long would a satellite located as far away as the moon take to orbit the Earth? A) the same hour and a half B) less than an hour and a half C) about 28 days D) More information about the satellite is needed. E) none of these

C) about 28 days

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity A) increases. B) remains unchanged. C) decreases.

C) decreases.

The period of a satellite, the time it takes for a complete revolution, depends on the satellite's A) mass. B) weight. C) radial distance. D) all of these E) none of these

C) radial distance.

A projectile is fired vertically from the surface of the Earth at 5 km/s. The projectile will A) go into circular about the Earth. B) go into an elliptical orbit about the Earth. C) rise and fall back to the Earth's surface. D) none of these

C) rise and fall back to the Earth's surface.

The fastest moving planet in a solar system is A) the smallest planet. B) the most massive planet. C) the planet nearest the sun. D) the planet farthest from the sun. E) any planet, for they all move at the same speed.

C) the planet nearest the sun.

A projectile is launched at ground level an angle of 15 degrees above the horizontal and lands down range. What other projection angle for the same speed would produce the same down-range distance? A) 30 degrees B) 45 degrees C) 50 degrees D) 75 degrees E) 90 degrees

D) 75 degrees

Our moon travels the fastest as it orbits the Earth when it is A) performing an eclipse. B) rotating. C) revolving. D) closest. E) All of the above choices are true.

D) closest.

A bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is about A) 200 m. B) 300 m. C) 400 m. D) 500 m. E) 600 m.

E) 600 m.